CN113849008A - PH value control system - Google Patents
PH value control system Download PDFInfo
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- CN113849008A CN113849008A CN202111216611.6A CN202111216611A CN113849008A CN 113849008 A CN113849008 A CN 113849008A CN 202111216611 A CN202111216611 A CN 202111216611A CN 113849008 A CN113849008 A CN 113849008A
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Abstract
The present disclosure relates to a pH control system, the system comprising: the detection module is used for detecting the pH value of the solution to be regulated to obtain a detection voltage signal corresponding to the pH value of the solution to be regulated; a reagent supply module for providing a conditioning reagent; a regulating module connected to the detecting module and the reagent supplying module, for: generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal; and controlling the reagent supply module to add a pH adjusting reagent to the solution to be adjusted by utilizing the target adjusting signal so as to adjust the pH value of the solution to be adjusted. The embodiment of the disclosure can realize real-time accurate detection of the pH value of the solution to be detected, accurately and efficiently adjust the pH value of the solution to be adjusted in the effective period of the target adjusting signal, and can avoid material waste in the adjusting process.
Description
Technical Field
The disclosure relates to the technical field of automatic control, in particular to a pH value control system.
Background
The reaction kettle is widely applied to the fields of petroleum, chemical engineering, rubber, pesticides, dyes, medicines, foods and the like, is a pressure container for completing the technological processes of vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation and the like, and needs to sample and detect the pH value condition of the mixture of dye raw materials and adjust the pH value in the dye preparation process so as to improve the color fastness of the dyes.
However, the related art has problems of low accuracy and low efficiency in adjusting the pH value when the pH value is detected to deviate from the normal range.
Disclosure of Invention
According to an aspect of the present disclosure, there is provided a pH control system, the system comprising:
the detection module is used for detecting the pH value of the solution to be regulated to obtain a detection voltage signal corresponding to the pH value of the solution to be regulated;
a reagent supply module for providing a conditioning reagent;
a regulating module connected to the detecting module and the reagent supplying module, for:
generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal;
and controlling the reagent supply module to add a pH adjusting reagent to the solution to be adjusted by utilizing the target adjusting signal so as to adjust the pH value of the solution to be adjusted.
In a possible embodiment, the duration of the delay signal is used to determine the duration of the target adjustment signal, and the duration of the delay signal is positively correlated to the difference.
In a possible embodiment, the adjusting module is further configured to: and periodically generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal.
In a possible embodiment, the adjusting module is further configured to:
generating a delay signal according to the magnitude relation between the detection voltage signal and a preset voltage signal;
adjusting the delay time length of the delay signal according to the difference value of the detection voltage signal and a preset voltage signal to obtain an adjusted delay signal;
and generating the target adjusting signal by using the adjusted delay signal.
In one possible embodiment, the adjusting module comprises a comparing circuit, a delay circuit, a subtracting circuit, a timing circuit, and a triggering circuit, wherein,
the comparison circuit is connected to the detection module and used for receiving the detection voltage signal and the preset voltage signal and comparing the detection voltage signal and the preset voltage signal to obtain a comparison result signal, and the comparison result signal comprises the magnitude relation;
the delay circuit is connected with the comparison circuit and used for responding to the comparison result signal to generate a delay signal;
the subtraction circuit is connected to the detection module and used for receiving the detection voltage signal and the preset voltage signal and carrying out subtraction operation to obtain the difference value;
the time adjusting circuit is connected to the subtracting circuit and the delay circuit and is used for adjusting the delay time of the delay signal according to the difference value to obtain an adjusted delay signal;
and the trigger circuit is connected with the delay circuit and used for outputting the target adjusting signal according to the adjusted delay signal.
In a possible implementation manner, the comparison circuit includes a comparator, a first input terminal of the comparator is used for inputting the detection voltage signal, a second terminal of the comparator is used for inputting the preset voltage signal, and an output terminal of the comparator is used for outputting the comparison result signal;
in a possible implementation manner, the delay circuit includes a delay capacitor, a delay resistor, and a delay unit, a first end of the delay resistor is connected to a first end of the delay capacitor and a delay parameter setting end of the delay unit, and a second end of the delay capacitor is grounded;
in one possible implementation, the subtraction circuit includes a first operational amplifier, a second operational amplifier, a first feedback resistor, a second feedback resistor, a first input resistor, a second input resistor, a third input resistor, and a fourth input resistor, a first end of the first input resistor is grounded, a second end of the first input resistor and a first end of the first feedback resistor are connected to the inverting input terminal of the first operational amplifier, a first end of the second input resistor is used for inputting the detection voltage signal, a second end of the second input resistor is connected to the inverting input terminal of the first operational amplifier, a second end of the first feedback resistor is connected to the input terminal of the first operational amplifier and a first end of the third input resistor, a second end of the third input resistor and a first end of the second feedback resistor are connected to the inverting input terminal of the second operational amplifier, a second end of the second feedback resistor is connected to an output end of the second operational amplifier, a first end of the fourth input resistor is used for inputting the preset voltage signal, and an output end of the second operational amplifier is used for outputting the difference value;
in a possible implementation manner, the timing circuit includes a heating wire and a temperature-sensitive resistor, a first end of the temperature-sensitive resistor is connected to a second end of the delay resistor, a second end of the temperature-sensitive resistor is used for receiving a power voltage, a first end of the heating wire is used for receiving the difference, and a second end of the heating wire is grounded;
in a possible implementation manner, the trigger circuit includes a trigger transistor, a control terminal of the trigger transistor is connected to the output terminal of the delay unit and is configured to receive the adjusted delay signal, a first terminal of the trigger transistor is configured to output the target adjustment signal, and a second terminal of the trigger transistor is connected to ground.
In a possible embodiment, the adjusting module is further configured to: and periodically generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal.
In one possible embodiment, the adjustment module comprises:
the timing circuit is used for outputting a pulse signal with a preset peak value, and the period of the pulse signal is a set period;
and the judging circuit is connected with the timing circuit, the comparing circuit and the delay circuit and is used for transmitting the comparison result signal to the delay circuit at the rising edge or the falling edge of the pulse signal so that the delay circuit outputs a delay signal according to the set period to trigger the trigger circuit to generate a target adjusting signal.
In one possible embodiment, the timing circuit comprises a timing unit, a first timing resistor, a second timing resistor, a first adjustable resistor, a first timing capacitor, a second timing capacitor, the first end of the first adjustable resistor and the power supply end of the timing unit are used for receiving power supply voltage, the resistance adjusting end of the first adjustable resistor and the second end of the first adjustable resistor are connected with the first end of the first timing resistor, the second end of the first timing resistor is connected to the first end of the second timing resistor and the timing unit, a second end of the second timing resistor is connected to a first end of the first timing capacitor and the timing unit, the second end of the first timing capacitor, the first end of the second timing capacitor and the grounding end of the timing unit are grounded, and the second end of the second timing capacitor is connected to the timing unit;
in a possible implementation manner, the determining circuit includes a D flip-flop, a clock input end of the D flip-flop is connected to the output end of the timing unit, and the D flip-flop outputs a magnitude relationship between the detection voltage signal and a preset voltage signal in response to a rising edge or a falling edge of a pulse signal output by the output end of the timing unit, so as to trigger the adjusting module to generate a target adjusting signal according to the magnitude relationship and the difference between the detection voltage signal and the preset voltage signal.
In one possible embodiment, the detection module comprises a detection circuit, the detection circuit comprises a pH value sensor and an amplification circuit,
the probe of the pH value sensor is used for contacting with the solution to be regulated so as to detect the pH value of the solution to be regulated, and the output end of the pH value sensor is connected with the input end of the amplifying circuit and used for outputting an initial voltage signal;
the amplifying circuit is used for amplifying the initial voltage signal and outputting the detection voltage signal.
In one possible embodiment, the system further comprises:
the reference circuit comprises a first reference resistor and a second reference resistor, wherein a first end of the first reference resistor is used for receiving power supply voltage, a second end of the first reference resistor is connected to a first end of the second reference resistor and used for generating the preset voltage signal, and a second end of the second reference resistor is grounded.
In a possible embodiment, the reagent supply module comprises one or more storage spaces, each storage space is used for storing pH adjusting reagents with different pH values, each storage space is provided with an electromagnetic valve, and the adjusting module is further used for:
determining a target pH regulating reagent according to the magnitude relation between the detection voltage signal and a preset voltage signal;
and controlling the electromagnetic valve corresponding to the target pH adjusting reagent to be conducted by using the target adjusting signal so that the reagent supply module adds the pH adjusting reagent to the solution to be adjusted.
In one possible embodiment, the conduction time of the solenoid valve is determined according to the duration of the target adjustment signal.
The embodiment of the disclosure provides a pH control system, which uses a detection module to detect a pH value of a solution to be adjusted to obtain a detection voltage signal corresponding to the pH value of the solution to be adjusted, so as to realize real-time accurate detection of the pH value of the solution to be detected, and uses a reagent supply module to provide an adjusting reagent; the system utilizes the adjusting module to generate a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and the preset voltage signal, and utilizes the target adjusting signal to control the reagent supply module to add the pH adjusting reagent to the solution to be adjusted, so that the pH value of the solution to be adjusted can be accurately and efficiently adjusted in the effective period of the target adjusting signal, and the waste of materials in the adjusting process can be avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.
FIG. 1 shows a block diagram of a pH control system according to an embodiment of the present disclosure.
FIG. 2 shows a block diagram of a pH control system according to an embodiment of the present disclosure.
FIG. 3 shows a partial circuit schematic of a pH control system according to an embodiment of the present disclosure.
FIG. 4 shows a partial circuit schematic of a pH control system according to an embodiment of the present disclosure.
FIG. 5 shows a partial circuit schematic of a pH control system according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In the description of the present disclosure, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, should not be taken as limiting the present disclosure.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
When monitoring and adjusting the pH value in the stirring preparation process of the reaction kettle by the related technical scheme, although the pH value of the solution in the vertical reaction kettle can be measured by utilizing the pH electrode, and the operation of automatically adding alkali and stopping adding alkali is realized, the related technology cannot adjust the pH value of the solution in real time, quickly and accurately, the precision of the pH value is influenced, and the waste of materials such as alkali liquor is easily caused.
The embodiment of the disclosure provides a pH control system, which uses a detection module to detect a pH value of a solution to be adjusted to obtain a detection voltage signal corresponding to the pH value of the solution to be adjusted, so as to realize real-time accurate detection of the pH value of the solution to be detected, and uses a reagent supply module to provide an adjusting reagent; the system utilizes the adjusting module to generate a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and the preset voltage signal, and utilizes the target adjusting signal to control the reagent supply module to add the pH adjusting reagent to the solution to be adjusted, so that the pH value of the solution to be adjusted can be accurately and efficiently adjusted in the effective period of the target adjusting signal, and the waste of materials in the adjusting process can be avoided.
Referring to fig. 1, fig. 1 shows a block diagram of a pH control system according to an embodiment of the present disclosure.
As shown in fig. 1, the system includes:
the detection module 10 is used for detecting the pH value of the solution to be regulated to obtain a detection voltage signal corresponding to the pH value of the solution to be regulated;
a reagent supply module 20 for providing a conditioning reagent;
a regulating module 30 connected to the detecting module 10 and the reagent supplying module 20, for:
generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal;
and controlling the reagent supply module 20 to add a pH adjusting reagent to the solution to be adjusted by using the target adjusting signal so as to adjust the pH value of the solution to be adjusted.
The detection module 10, the reagent supply module 20, and the adjustment module 30 of the embodiment of the present disclosure may include various implementations, which are not limited by the embodiment of the present disclosure, and the following describes some possible implementations of the modules by way of example.
Referring to fig. 2, fig. 2 shows a block diagram of a pH control system according to an embodiment of the present disclosure.
In one possible embodiment, as shown in fig. 2, the detection module 10 may include a detection circuit 1, the adjustment module 30 may include at least one of a reference circuit 2, a comparison circuit 3, a delay circuit 4, a trigger circuit 5, a timing circuit 6, a judgment circuit 7, a subtraction circuit 8, and a timing circuit 9, and the reagent supply module 20 may include an electromagnetic valve. It should be noted that, although the embodiments of the present disclosure take the circuits of fig. 2 as examples to describe the modules of the pH control system, the embodiments of the present disclosure are not limited thereto, and the embodiments of the present disclosure do not limit the implementation manner of the modules of the pH control system, and those skilled in the art may also implement the embodiments in other manners.
Referring to fig. 3, fig. 3 is a schematic diagram of a portion of a circuit of a pH control system according to an embodiment of the disclosure.
In one example, as shown in fig. 3, the detection circuit 1 may include a pH sensor 11 and an amplification circuit 12.
For example, the pH sensor 11 may include a probe, the probe of the pH sensor 11 is configured to contact the solution to be adjusted to detect the pH value of the solution to be adjusted, and an output end of the pH sensor 11 is connected to an input end of the amplifying circuit 12 and configured to output an initial voltage signal.
For example, the amplifying circuit 12 may be configured to amplify the initial voltage signal and output the detection voltage signal, as shown in fig. 3, the amplifying circuit 12 may include an amplifying transistor Q1, a resistor R11, and a resistor R12, wherein the resistor R11 may be connected in series as a bias resistor at a control terminal and a first terminal of the amplifying transistor Q1, and the exemplary amplifying transistor may be a triode, in which case the first terminal of the amplifying transistor Q1 is a collector; of course, the amplifying transistor may be a transistor, and is not limited herein. The amplifying transistor Q1 will be exemplarily described as a triode. As shown in fig. 3, the collector of the amplifying transistor Q1 may receive the power supply voltage VCC through a resistor R12, the control terminal (base) of the amplifying transistor Q1 may be connected to an output terminal of the pH sensor 11 through a capacitor, and the emitter of the amplifying transistor Q1 and the ground terminal of the pH sensor 11 may be grounded. The above description of the amplifying circuit 12 is exemplary, and should not be considered as a limitation to the embodiments of the present disclosure, in other embodiments, the amplifying circuit 12 may further include other implementation manners, for example, amplification may be implemented by combining a plurality of transistors, amplification may also be implemented by using a packaged integrated circuit, and the amplifying circuit 12 may amplify a signal collected by the pH monitoring probe, so as to reduce loss in a signal transmission process, and improve accuracy of signal processing.
It should be noted that although the monitoring circuit including the pH sensor 11 and the amplifying circuit 12 is exemplarily described in the embodiments of the present disclosure, the embodiments of the present disclosure are not limited thereto, in other embodiments, the detection module 10 may further include other signal processing circuits such as a filter circuit, and the like, and the types of the pH sensor may include multiple types. Through the detection circuit 1, the embodiment of the present disclosure can realize real-time, accurate and efficient detection of the pH value of the solution to be adjusted, and convert the pH value into a voltage signal for subsequent processing.
In a possible embodiment, the reagent supply module 20 includes one or more storage spaces, each storage space is used for storing pH adjustment reagents with different pH values, each storage space is provided with an electromagnetic valve, for example, the storage space may be a solution storage tank, each storage space may include acid liquor and alkali liquor, the concentrations (pH value) of the acid liquor and the alkali liquor may be set as required, the solution storage tank may include a reagent flow passage (such as a liquid transport tube), a pump, etc., the electromagnetic valve is disposed at an outlet of the liquid transport tube or other positions, and when the electromagnetic valve is opened (turned on), the reagent in the solution storage tank may be added into the solution to be adjusted through the liquid transport tube by a pumping action.
In a possible embodiment, the adjusting module 30 may be further configured to:
determining a target pH regulating reagent according to the magnitude relation between the detection voltage signal and a preset voltage signal;
and controlling the electromagnetic valve corresponding to the target pH adjusting reagent to be conducted by using the target adjusting signal, so that the reagent supply module 20 adds the pH adjusting reagent to the solution to be adjusted.
In one example, the preset voltage signal may correspond to a pH threshold or a pH range, the preset voltage signal may include a plurality of preset voltage signals, or may be one preset voltage signal, and by comparing the detected voltage signal with the preset voltage signal, it may be determined whether the pH of the solution to be adjusted currently needs to be adjusted, for example, if the pH of the solution to be adjusted is smaller than a target value, it may be determined that the pH of the solution to be adjusted needs to be increased, and an alkaline reagent may be selected as the target pH adjusting reagent; if the pH value of the solution to be adjusted is greater than the target value, it may be determined that the pH value of the solution to be adjusted needs to be decreased, and an acidic reagent may be selected as the target pH value adjusting reagent, and the pH values of the acidic reagent and the alkaline reagent in the embodiment of the present disclosure may be preset. Of course, in some environments, it is also possible to further provide a storage space, and only provide an acidic reagent or an alkaline reagent, for example, in some scenarios, it is necessary to keep the pH value neutral, but the pH value of the solution becomes acidic along with the entering of gas such as carbon dioxide in the air, in this case, only one alkaline reagent needs to be provided, and when the detection module detects that the pH value of the solution to be adjusted is smaller than the preset pH value, a target adjustment signal is generated to control the electromagnetic valve corresponding to the target pH adjustment reagent to be turned on, so that the reagent supply module 20 adds the pH adjustment reagent to the solution to be adjusted, that is, in this scenario, the pH adjustment reagent does not need to be determined.
In one possible embodiment, as shown in fig. 2, the system may further include:
and the reference circuit 2 is used for providing the preset voltage signal.
In one example, as shown in fig. 3, the reference circuit 2 may include a first reference resistor R31 and a second reference resistor R32, a first end of the first reference resistor R31 is configured to receive a power supply voltage VCC, a second end of the first reference resistor R31 is connected to a first end of the second reference resistor R32 for generating the preset voltage signal, and a second end of the second reference resistor R32 is grounded. The embodiment of the disclosure can obtain accurate preset voltage signals by configuring the resistance values of the first reference resistor R31 and the second reference resistor R32, and the method is simple to implement, low in cost and easy to popularize and utilize. Of course, the above description of the reference circuit 2 is exemplary and should not be considered as a limitation to the embodiment of the present disclosure, in other embodiments, the voltage dividing resistor network for obtaining the preset voltage signal may have other implementation manners, and of course, the voltage generating module may also be directly utilized to generate the required preset voltage signal, for example, the voltage generating module is implemented by an AC/DC module, a DC/DC module, or the like.
A possible implementation of the adjustment module 30 is exemplarily described below.
In a possible embodiment, the adjusting module 30 may be further configured to:
generating a delay signal according to the magnitude relation between the detection voltage signal and a preset voltage signal;
adjusting the delay time length of the delay signal according to the difference value of the detection voltage signal and a preset voltage signal to obtain an adjusted delay signal;
and generating the target adjusting signal by using the adjusted delay signal.
The method and the device for adjusting the pH value of the solution to be adjusted generate the delay signal according to the magnitude relation between the detection voltage signal and the preset voltage signal, adjust the delay time of the delay signal according to the difference value between the detection voltage signal and the preset voltage signal to obtain the adjusted delay signal, and generate the target adjusting signal by using the adjusted delay signal so as to generate the target adjusting signal according to the magnitude relation and the difference value between the detection voltage signal and the preset voltage signal, thereby accurately and efficiently adjusting the pH value of the solution to be adjusted.
Of course, the above description of the implementation manner of generating the target adjustment signal according to the magnitude relationship and the difference between the detection voltage signal and the preset voltage signal is exemplary and should not be regarded as a limitation of the present disclosure, and the embodiment of the present disclosure may also obtain the target adjustment signal through a mapping relationship set in advance, where the mapping relationship may be a correspondence relationship between the magnitude relationship and the difference between the detection voltage signal and the preset voltage signal and the target adjustment signal, and the target adjustment signal may be quickly obtained through the magnitude relationship and the difference between the detection voltage signal and the preset voltage signal and the mapping relationship, for example, the adjustment module 30 may be implemented by a processing component, and the processing component includes but is not limited to a separate processor, or a separate component, or a combination of a processor and a separate component. The processor may comprise a controller having functionality to execute instructions in an electronic device, which may be implemented in any suitable manner, e.g., by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components. In the processor, the executable instruction may be executed by hardware circuits such as a logic gate, a switch, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, so as to generate a target adjustment signal according to a magnitude relationship and a difference between the detected voltage signal and a preset voltage signal.
In one example, a memory module may include a computer-readable storage medium, which may be a tangible device that may hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a programmable read-only memory (PROM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing.
Of course, in the embodiment of the present disclosure, a dedicated hardware circuit may also be used to generate a delay signal according to a magnitude relationship between the detection voltage signal and the preset voltage signal, adjust a delay duration of the delay signal according to a difference between the detection voltage signal and the preset voltage signal to obtain an adjusted delay signal, and generate the target adjustment signal by using the adjusted delay signal, which is described in the following exemplary description.
In one possible implementation, as shown in fig. 2, the adjusting module 30 may include a comparing circuit 3, a delay circuit 4, a subtracting circuit 8, a timing circuit 9, and a triggering circuit 5.
In an example, as shown in fig. 2, the comparison circuit 3 is connected to the detection module 10 (detection circuit 1), and configured to receive the detection voltage signal and the preset voltage signal and compare the detection voltage signal and the preset voltage signal to obtain a comparison result signal, where the comparison result signal includes the magnitude relationship;
in one example, the delay circuit 4 is coupled to the comparison circuit 3, and configured to generate a delay signal in response to the comparison result signal, and for example, the delay circuit 4 may be configured with a delay time of a preset duration;
in an example, as shown in fig. 2, the subtraction circuit 8 is connected to the detection module 10 (detection circuit 1) and configured to receive the detection voltage signal and the preset voltage signal and perform a subtraction operation to obtain the difference value;
in an example, as shown in fig. 2, the time adjusting circuit 9 is connected to the subtracting circuit 8 and the delay circuit 4, and configured to adjust a delay duration of the delay signal according to the difference value, so as to obtain an adjusted delay signal;
in one example, as shown in fig. 2, the trigger circuit 5 is connected to the delay circuit 4, and configured to output the target adjustment signal according to the adjusted delay signal.
In one possible embodiment, the duration of the delay signal is used to determine the duration of the target adjustment signal. The embodiment of the disclosure determines the time length of the target adjusting signal through the delay signal, can control the time length of the pH value adjustment, and improves the flexibility of adjustment.
In one possible embodiment, the duration of the delay signal is positively correlated with the difference. According to the embodiment of the disclosure, the time length of the delay signal is positively correlated with the difference value, and the difference value can be utilized to perform adaptive adjustment on the time length of the delay signal, so that the accurate control of the pH value adjustment time length of the solution to be adjusted is realized, and the adaptability is improved.
According to the embodiment of the disclosure, the comparison circuit can receive the detection voltage signal and the preset voltage signal and compare the detection voltage signal and the preset voltage signal to obtain a comparison result signal, the comparison result signal includes the magnitude relation, the delay circuit responds to the comparison result signal to generate a delay signal, and the subtraction circuit receives the detection voltage signal and the preset voltage signal and performs subtraction operation to obtain the difference value; the time delay of the time delay signal is adjusted according to the difference value through the time adjusting circuit to obtain the adjusted time delay signal, the adjusted time delay signal is output according to the adjusted time delay signal through the trigger circuit, the time set by the time delay circuit can be adjusted through the subtraction circuit and the time adjusting circuit, and therefore when the pH value difference value is large, the time for injecting the pH adjusting reagent is prolonged, the time for injecting the pH adjusting reagent is reduced when the difference value is small, accurate liquid adding is achieved, and waste of materials is avoided.
The comparison circuit 3, the delay circuit 4, the subtraction circuit 8, the timing circuit 9, and the trigger circuit 5 of the embodiments of the present disclosure may include various possible implementations, which are exemplarily described below.
In a possible implementation manner, as shown in fig. 3, the comparison circuit 3 may include a comparator 31, a first input end of the comparator 31 is used for inputting the detection voltage signal, a second end of the comparator 31 is used for inputting the preset voltage signal, and an output end of the comparator 31 is used for outputting the comparison result signal.
Referring to fig. 4, fig. 4 is a schematic diagram of a portion of a circuit of a pH control system according to an embodiment of the disclosure.
Referring to fig. 5, fig. 5 is a schematic diagram of a portion of a circuit of a pH control system according to an embodiment of the disclosure.
In a possible implementation manner, as shown in fig. 5, the delay circuit 4 may include a delay capacitor C3, a delay resistor R44, and a delay unit 41, where a first end of the delay resistor R44 is connected to a first end of the delay capacitor C3 and a delay parameter setting end of the delay unit 41, and a second end of the delay capacitor C3 is grounded, and the delay unit 41 according to the embodiment of the present disclosure may be implemented based on a monostable flip-flop of the chip NE555, or implemented by using other chips, so that the embodiment of the present disclosure has a good circuit integration level, and a required preset delay duration may be obtained by setting sizes of the delay capacitor C3 and the delay resistor R44. Illustratively, as shown in fig. 5, the delay circuit 4 may further include a capacitor C4. Illustratively, the delay unit 41 may be connected to an output of the comparison circuit to output a delay signal in response to the comparison result; and can also be connected to the output end (C connection point) of the judgment circuit to realize periodic liquid injection control, which is described in an exemplary manner below.
In one possible implementation, as shown in fig. 4, the subtracting circuit 8 may include a first operational amplifier Amp1, a second operational amplifier Amp2, a first feedback resistor Rf1, a second feedback resistor Rf2, a first input resistor R81, a second input resistor R82, a third input resistor R83, and a fourth input resistor R84, a first end of the first input resistor R81 is grounded, a second end of the first input resistor R81 and a first end of the first feedback resistor Rf1 are connected to the inverting input terminal of the first operational amplifier Amp1, a first end of the second input resistor R82 is used for inputting the detection voltage signal (for example, the first end of the second input resistor R82 may be connected to the negative input terminal of the comparator 31 and the amplifying circuit through an a connection point), a second end of the second input resistor R82 is connected to the positive input terminal of the first operational amplifier Amp1, and a second end of the first feedback resistor 1 is connected to the first input terminal of the first operational amplifier Amp1 and the third input terminal of the third input resistor R83 A first end of the third input resistor R83 and a first end of the second feedback resistor Rf2 are connected to the inverting input terminal of the second operational amplifier Amp2, a second end of the second feedback resistor Rf2 is connected to the output terminal of the second operational amplifier Amp2, a first end of the fourth input resistor R84 is used for inputting the preset voltage signal (for example, the first end of the fourth input resistor R84 may be connected to the forward input terminal of the comparator 31 and the first end of the voltage dividing resistor R32 through a B connection point), and an output terminal of the second operational amplifier Amp2 is used for outputting the difference. Illustratively, the embodiment of the present disclosure may implement a subtraction circuit based on a differential proportional operation circuit of the chip LM324 or by using other manners, and through the subtraction circuit 8, the embodiment of the present disclosure may implement calculation of a difference value between the detection voltage signal and the preset voltage signal, so as to accurately and quickly adjust the delay duration of the delay signal in the following process, and perform subtraction operation on the monitoring voltage signal and the preset voltage signal through the subtraction circuit, and the embodiment of the present disclosure has the characteristics of high integration level, low cost, and is convenient for maintenance and debugging.
In a possible implementation manner, as shown in fig. 5, the timing circuit 9 may include a heating wire 91 and a temperature-sensitive resistor Rt, a first end of the temperature-sensitive resistor Rt is connected to a second end of the delay resistor R44, a second end of the temperature-sensitive resistor Rt is configured to receive a power supply voltage VCC, the first end of the heating wire 91 is configured to receive the difference, and the second end of the heating wire 91 is grounded. Illustratively, a resistor Ri may be provided between the heating wire 91 and the output (D) of the subtraction circuit to improve the stability of the circuit.
In one possible implementation, as shown in fig. 5, the trigger circuit 5 may include a trigger transistor Q2, a control terminal of the trigger transistor Q2 is connected to the output terminal of the delay unit 41 for receiving the adjusted delay signal, a first terminal of the trigger transistor Q2 is used for outputting the target adjustment signal, and a second terminal of the trigger transistor Q2 is connected to ground. The specific type of the trigger transistor Q2 is not limited in the embodiments of the present disclosure, and can be set as required by those skilled in the art. In one example, as shown in fig. 5, a collector of a trigger transistor (for example, a triode) may be connected to the solenoid valve to control the conducting state of the solenoid valve, during the effective time of the delay signal (the adjusted delay time), the trigger transistor Q2 is turned on, the power voltage is applied to the solenoid valve KM1 after passing through the voltage dividing resistor R51, the solenoid valve KM1 is turned on, and the conditioning reagent corresponding to the solenoid valve KM1 is added to the solution to be conditioned. In one example, diodes may be provided at both ends of the solenoid valve KM1 to prevent the current from flowing backward. Of course, the above description of the triggering circuit 5 is exemplary, and a person skilled in the art may implement the control of the solenoid valve KM1 in other manners as needed, and the solenoid valve KM1 may be replaced by other types of switches, and the embodiment of the present disclosure is not limited thereto.
In one example, as shown in fig. 5, a light emitting diode D2 may be provided between the delay circuit 4 and the trigger circuit 5, and when the delay signal is asserted, the light emitting diode D2 is illuminated to indicate that pH adjustment is in progress.
When the pH value is regulated, the pH value of the solution under regulation needs to be detected in real time, and because a reagent (such as alkali liquor) needs a period of mixing time when entering the reaction kettle for stirring and mixing, the related technology usually collects the pH value in the process of adding the reagent or when stopping adding the reagent, so that the collected pH value has deviation with the actual final mixed pH value, the precision of the pH value is influenced, and the waste of materials such as alkali liquor is easily caused.
In a possible embodiment, the adjusting module 30 may be further configured to: and periodically generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal.
According to the embodiment of the disclosure, the target adjusting signal is generated periodically according to the magnitude relation and the difference between the detection voltage signal and the preset voltage signal, liquid is injected within the time delay duration corresponding to the time delay signal, and the solution to be adjusted is stirred within the set time duration (for example, the time except the action of the time delay signal in one period), so that the accuracy of collecting the pH value of the solution to be adjusted in the reaction kettle is improved, the manner of intermittently adding the adjusting reagent is adopted, the pH value is adjusted efficiently and accurately, and the waste of materials in the alkali adding process is avoided.
In one possible embodiment, as shown in fig. 2, the adjusting module 30 may include:
the timing circuit 6 is used for outputting a pulse signal with a preset peak value, and the period of the pulse signal is a set period;
and the judging circuit 7 is connected to the timing circuit 6, the comparing circuit 3 and the delay circuit 4, and is configured to transmit the comparison result signal to the delay circuit 4 at a rising edge or a falling edge of the pulse signal, so that the delay circuit 4 outputs a delay signal according to the set period to trigger the trigger circuit 5 to generate a target adjustment signal.
The embodiment of the present disclosure may periodically generate the target adjustment signal according to the magnitude relationship and the difference between the detection voltage signal and the preset voltage signal through the timing circuit and the determination circuit, and of course, the embodiment of the present disclosure may also be implemented in other manners, which is not limited in the embodiment of the present disclosure.
In a possible implementation manner, as shown in fig. 3, the timing circuit 6 includes a timing unit 61, a first timing resistor R61, a second timing resistor R62, a first adjustable resistor RP1, a first timing capacitor C1, and a second timing capacitor C2, a first end of the first adjustable resistor RP1 and a power supply end of the timing unit 61 are configured to receive a power supply voltage VCC, a resistance adjustment end of the first adjustable resistor RP1 and a second end of the first adjustable resistor RP1 are connected to a first end of the first timing resistor R61, a second end of the first timing resistor R61 is connected to a first end of the second timing resistor R62 and the timing unit 61, a second end of the second timing resistor R62 is connected to the first end of the first timing capacitor C1 and the timing unit 61, a second end of the first timing capacitor C1, a first end of the second timing capacitor C2 and a ground end of the timing unit 61, a second terminal of the second timing capacitor C2 is connected to the timing unit 61. Illustratively, the timing unit may be implemented based on a timing chip (e.g., NE 555).
In a possible embodiment, the determining circuit 7 comprises a D flip-flop, a clock input of which is connected to an output of the timing unit 61, the D flip-flop outputs the magnitude relation of the detection voltage signal and a preset voltage signal in response to a rising edge or a falling edge of the pulse signal output from the output terminal of the timing unit 61, to trigger the adjusting module 30 to generate a target adjusting signal according to the magnitude relation and difference between the detection voltage signal and the preset voltage signal, for example, the output terminal C of the D flip-flop is connected to the enable terminal of the delay unit 41 of the delay circuit 4 to output the comparison result to the delay unit 41, by means of the D trigger, when the timing signal is supplied to the falling edge (for example) of the pulse signal, the comparison result signal is transmitted to the delay circuit, and the delay circuit is triggered.
The detection circuit of the embodiment of the disclosure samples the pH value of a solution to be regulated in a reaction kettle, a preset voltage signal provided by a comparison circuit and a reference circuit is compared, a timing circuit and a judgment circuit are arranged, the solution to be regulated in the reaction kettle can be detected continuously and intermittently, a comparison result signal is output when the detection voltage signal is smaller than the preset voltage signal (exemplary), so that a trigger circuit controls an electromagnetic valve to be switched on to realize pH value regulation, liquid is injected in a set time period when the detection voltage signal is small through a delay circuit, the set time period is reserved to stir and mix the reaction kettle, the precision of collecting the pH value of the solution in the reaction kettle is improved, and the alkali liquor is added intermittently, the pH value is convenient to regulate, and the waste of materials in the alkali adding process is avoided.
The operation of the pH control system of the present disclosure is described below with reference to fig. 2, 3, 4, and 5.
In one example, a detection probe of the detection circuit monitors the pH value of a solution to be regulated in a reaction kettle, a voltage signal is output and amplified through a transistor, the amplified detection voltage signal is transmitted to a voltage comparator and compared with a preset voltage signal, when the detection voltage signal is smaller than the preset voltage signal, namely the pH value of the solution is smaller than the set pH value, and the solution is acidic, the voltage comparator outputs a high-level signal to a judgment circuit of a D trigger, a pulse signal provided by a timing circuit is used for transmitting a comparison result signal to a delay circuit 4 to trigger the delay circuit at each falling edge, the delay circuit 4 outputs a transient steady-state signal with set duration, a switching triode in a trigger circuit 5 is conducted within the set duration to keep the actuation of a relay KM1, so that the power supply triggering of an electromagnetic valve is realized, and opening an alkali liquor pipe to perform alkali adding operation.
The pH value control system of the embodiment of the disclosure does not need to add an adjusting reagent manually, reduces the labor intensity of people, and adopts the pH value monitoring probe to monitor the pH value in real time, thereby solving the inconvenience of manual sampling, and the temperature of the electric heating wire changes the resistance value of the temperature sensitive resistor along with the voltage output by the subtraction circuit, thereby changing the duration of the transient state output by the monostable trigger, improving the accuracy of alkali liquor adding, being convenient for adjusting the pH value, and avoiding the waste of materials in the alkali adding process.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A pH control system, comprising:
the detection module is used for detecting the pH value of the solution to be regulated to obtain a detection voltage signal corresponding to the pH value of the solution to be regulated;
a reagent supply module for providing a conditioning reagent;
a regulating module connected to the detecting module and the reagent supplying module, for:
generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal;
and controlling the reagent supply module to add a pH adjusting reagent to the solution to be adjusted by utilizing the target adjusting signal so as to adjust the pH value of the solution to be adjusted.
2. The system of claim 1, wherein the adjustment module is further configured to: and periodically generating a target adjusting signal according to the magnitude relation and the difference value of the detection voltage signal and a preset voltage signal.
3. The system of claim 1, wherein the adjustment module is further configured to:
generating a delay signal according to the magnitude relation between the detection voltage signal and a preset voltage signal;
adjusting the delay time length of the delay signal according to the difference value of the detection voltage signal and a preset voltage signal to obtain an adjusted delay signal;
and generating the target adjusting signal by using the adjusted delay signal.
4. The system of claim 3, wherein the duration of the delay signal is used to determine the duration of the target adjustment signal, and wherein the duration of the delay signal is positively correlated to the difference.
5. The system of any of claims 1-4, wherein the adjustment module comprises a comparison circuit, a delay circuit, a subtraction circuit, a timing circuit, a trigger circuit, wherein,
the comparison circuit is connected to the detection module and used for receiving the detection voltage signal and the preset voltage signal and comparing the detection voltage signal and the preset voltage signal to obtain a comparison result signal, and the comparison result signal comprises the magnitude relation;
the delay circuit is connected with the comparison circuit and used for responding to the comparison result signal to generate a delay signal;
the subtraction circuit is connected to the detection module and used for receiving the detection voltage signal and the preset voltage signal and carrying out subtraction operation to obtain the difference value;
the time adjusting circuit is connected to the subtracting circuit and the delay circuit and is used for adjusting the delay time of the delay signal according to the difference value to obtain an adjusted delay signal;
and the trigger circuit is connected with the delay circuit and used for outputting the target adjusting signal according to the adjusted delay signal.
6. The system of claim 5, wherein the adjustment module further comprises:
the timing circuit is used for outputting a pulse signal with a preset peak value, and the period of the pulse signal is a set period;
and the judging circuit is connected with the timing circuit, the comparing circuit and the delay circuit and is used for transmitting the comparison result signal to the delay circuit at the rising edge or the falling edge of the pulse signal so that the delay circuit outputs a delay signal according to the set period to trigger the trigger circuit to generate a target adjusting signal.
7. The system of claim 1, wherein the detection module comprises a detection circuit comprising a pH sensor and an amplification circuit,
the probe of the pH value sensor is used for contacting with the solution to be regulated so as to detect the pH value of the solution to be regulated, and the output end of the pH value sensor is connected with the input end of the amplifying circuit and used for outputting an initial voltage signal;
the amplifying circuit is used for amplifying the initial voltage signal and outputting the detection voltage signal.
8. The system of any one of claims 1-4, wherein the reagent supply module comprises one or more storage spaces, each storage space for storing a pH adjusting reagent having a different pH, each storage space provided with a solenoid valve, the adjustment module further configured to:
determining a target pH regulating reagent according to the magnitude relation between the detection voltage signal and a preset voltage signal;
and controlling the electromagnetic valve corresponding to the target pH adjusting reagent to be conducted by using the target adjusting signal so that the reagent supply module adds the pH adjusting reagent to the solution to be adjusted.
9. The system of claim 8, wherein the on-time of the solenoid valve is determined based on the duration of the target adjustment signal.
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| CN116750857A (en) * | 2023-08-17 | 2023-09-15 | 秦皇岛海绵环保设备有限公司 | Intelligent sewage treatment system based on biological regulation and control |
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